Help! Need Lunch Ideas

I need lunch ideas for DH. He is starting a new clinical rotation for school on Monday and the new location doesn't have a place to warm up food or a refrigerator, so leftovers are out of the question. He is going to be at work from about 4am to 8pm every day, so nutritious and filling are important.

I'm going to make salads and sandwiches, but does anyone have other ideas? He's working 6-7 days a week for the next 5 weeks so if I can give him some variety it would be great.